When possible, avoid stretches that place your lower back into flexion and rotation (bending and twisting). Discs can be injured from either too vigorous or too prolonged of a stretch in this position.

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This variation of the hamstring stretch puts your lower back into flexion and rotation, increasing your risk of injury.

This standing variation of the hamstring stretch is safer for your back - the chest is up and the natural curve in your lower back (lordosis) is maintained.